Tetrakisphenol Compound A Crystallization for Industrial Handling
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Solution Overview
Problem
There is a lack of specific production methods and reports on the physical properties of 4,4′-bis(1,1-bis(4-hydroxy-3-methylphenyl)ethyl)biphenyl (compound A), a tetrakis phenol compound, and no crystals of compound A have been obtained.
Innovation Solution
The crystal of 4,4′-bis(1,1-bis(4-hydroxy-3-methylphenyl)ethyl)biphenyl is produced through a dehydration-condensation reaction between o-cresol and 4,4′-diacylbiphenyl, using specific solvent and catalyst conditions, resulting in crystals with defined endothermic peak temperatures and X-ray diffraction patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If compound A is produced using conventional dehydration-condensation methods, then the compound can be synthesized, but no crystals have been obtained and specific production methods are lacking
Solution Approach 1:
The patent applies parameter changes by optimizing the solvent system (using mixed solvents like toluene/ethyl acetate or xylene/ethyl acetate), catalyst selection (p-toluenesulfonic acid), temperature control (reflux conditions), and pH adjustment (adding NaOH to reach pH 7-8) to enable crystal isolation of compound A, which had previously not been achieved
Solution Approach 2:
The patent utilizes phase transitions by controlling the crystallization process from solution through pH adjustment and temperature control, transforming compound A from a synthesized product into isolated crystals with specific melting point (150-165°C) and characteristic X-ray diffraction patterns
2Ease of operation
If compound A is isolated as crystals, then handling and storage efficiency improve, but specific crystallization conditions must be established
Solution Approach 1:
The patent uses an intermediary approach by introducing specific solvents (toluene, xylene, ethyl acetate) and catalysts (p-toluenesulfonic acid) that mediate the crystallization process, enabling compound A to form crystals with high bulk density and easy handling properties
Solution Approach 2:
The patent applies self-service by utilizing the compound's own properties (solubility characteristics, pH sensitivity) to enable spontaneous crystallization when the reaction mixture is adjusted to pH 7-8 and allowed to stand, without requiring complex external equipment or procedures
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The produced crystals of compound A are suitable for industrial production, offering easy handling, high purity, and high bulk density, enhancing transportation, storage, and reaction efficiency.
Implementation Method 1
a method in which phenol and 4,4'-diacylbiphenyl are allowed to undergo a dehydration-condensation reaction
Implementation Method 2
an endothermic peak top temperature determined by differential scanning calorimetry is in a range of 150°C to 165°C
Implementation Method 3
having diffraction peaks at diffraction angles 2θ of 7.8°±0.2°, 13.8°±0.2°, and 16.9°±0.2° in a powder X-ray diffraction peak pattern obtained using Cu-Kα radiation
Implementation Method 4
a step of crystallizing 4,4'-bis(1,1-bis(4-hydroxy-3-methylphenyl)ethyl)biphenyl from a solution containing an alkyl acetate ester solvent having a total of 4 to 8 carbon atoms and a cyclic saturated hydrocarbon solvent having 5 to 8 carbon atoms
Data Source
AI summary
An object is to provide an isolate of 4,4′-bis(1,1-bis(4-hydroxy-3-methylphenyl)ethyl)biphenyl in a form suitable for industrial production. As a solution, a crystal of 4,4′-bis(1,1-bis(4-hydroxy-3-methylphenyl)ethyl)biphenyl is provided.